STM32 Temperature/Current Sensor and Fan Controller

This project implements firmware for an STM32F103RBT7 microcontroller designed to:

1. Measure temperature using an MCP9701A analog sensor.
2. Measure current using an INA4181A4 current sense amplifier and a shunt resistor.
3. Control a cooling fan via PWM based on the measured temperature.

The firmware utilizes the STM32 HAL library, DMA for efficient ADC sampling, and timers for PWM generation and ADC triggering.

Features

• Reads temperature (MCP9701A) and current (INA4181A4).
• Uses TIM3-triggered ADC with DMA for efficient sampling at 1 kHz.
• Applies a moving average filter (configurable window size) to sensor readings.
• Controls a fan using 100 kHz PWM generated by TIM2.
• Implements linear fan speed control based on configurable temperature thresholds.
• Designed for STM32F103RBT7 MCU.
• Built using STM32 HAL library and ARM GCC toolchain.

Hardware Requirements

• Microcontroller: STM32F103RBT7
• Temperature Sensor: MCP9701AT-E/TT (or other compatible 500mV @ 0°C, 10mV/°C analog sensor)
• Current Sensor: INA4181A4QPWRQ1 (100 V/V gain variant)
• Shunt Resistor: Value defined in code (Ohm) - ensure appropriate wattage rating for expected current.
• Fan: Standard 2, 3, or 4-wire PWM controllable DC fan.
• Power Supply: Appropriate voltage(s) for MCU (3.3V), sensors, and fan.

Software Requirements

• Toolchain: ARM GCC (arm-none-eabi-gcc)
• Build System: Make
• Programming Utility: STM32CubeProgrammer, ST-Link Utility, or OpenOCD for flashing the firmware onto the MCU.

Getting Started

1. Clone the repository:

   git clone https://github.com/CPRT/SmartPDB.git
   cd SmartPDB

2. Configure Project: Review and adjust parameters in Core/Inc/main.h (or relevant config file) as needed (see Configuration section below). Ensure pin definitions match your hardware connections.
3. Build the firmware:
   • Using Make:

     make clean
     make

   • Using an IDE: Import the project and use the IDE's build command.
4. Flash the firmware:
   • The compiled firmware will located in build/
   • Use your chosen programming utility (e.g., STM32CubeProgrammer) and an ST-Link debugger/programmer to flash the .bin or .elf file onto the STM32F103RBT7.

Configuration

• Sensor Parameters:
  • MCP9701_TC: Temperature sensor coefficient (V/°C).
  • MCP9701_V0C: Temperature sensor voltage offset at 0°C (V).
  • INA4181_GAIN: Gain of the current sense amplifier (V/V).
  • SHUNT_RESISTOR_OHMS: Value of the current shunt resistor (Ohms).
• ADC & Filtering:
  • V_REF: ADC reference voltage (usually 3.3V).
  • ADC_FILTER_BUFFER_SIZE: Number of samples for the moving average filter window.
• Fan Control:
  • TEMP_MIN_THRESHOLD: Temperature (°C) below which the fan runs at minimum speed.
  • TEMP_MAX_THRESHOLD: Temperature (°C) above which the fan runs at maximum speed.
  • FAN_PWM_MIN_DUTY_PERCENT: Minimum fan duty cycle (%).
  • FAN_PWM_MAX_DUTY_PERCENT: Maximum fan duty cycle (%).

Pinout

• PA0: ADC_IN0 (Temperature Sensor Output)
• PA1: ADC_IN1 (Current Sensor Output)
• PA15: PWM Output to Fan Control Circuit

Contributing

Lmao dont touch my shit

License